泊松分布单光子源的光束分离器窃听模型  

Beam Splitter Eavesdropping Model Based on Single-photon Sources with Poisson Distribution

作　　者：张成龙[1] 张存华[2] 姬广举[1] 王振华[1] 李瑞[2] 杨玉强[1] 都文和[3] 张光宇[1] 

机构地区：[1]哈尔滨理工大学应用科学学院,黑龙江哈尔滨150080 [2]齐齐哈尔大学理学院,黑龙江齐齐哈尔161006 [3]齐齐哈尔大学通信与电子工程学院,黑龙江齐齐哈尔161006

出　　处：《哈尔滨理工大学学报》2015年第1期100-104,共5页Journal of Harbin University of Science and Technology

基　　金：黑龙江省教育厅科学技术研究项目(12511119)

摘　　要：针对低轨卫星-地面站间量子密钥分配的光束分离器窃听问题,分析了泊松分布单光子源,建立了量子比特率理论模型,给出了光束分离器窃听中窃听率的表达式.从而分析了低轨卫星-地面站间量子密钥分配的光束分离器窃听问题.结果表明,对于低轨卫星-地面站间链路,每个脉冲平均光子数可以取最优值,窃听率在10-4量级.通过数据纠错和保密加强,可以使得窃听者所获得的密钥信息量降低到1比特以下.这说明,在低轨卫星-地面站间进行量子密钥分配是可行的,在保证系统具有很高量子比特率的同时,量子密钥分配仍然是安全的.In order to avoid beam splitter （BS） eavesdropping problem during quantum key distribution be- tween a ground station and a satellite in a low earth orbit, the single-photon sources with Poisson distribution are analyzed, the theoretical model of quantum bit rate is established and the expression of eavesdropping ratio in BS eavesdropping is given. The BS eavesdropping is analyzed for quantum key distribution between a ground station and a satellite in a low earth orbit. The results show that mean photon number per pulse can be optimized and that eavesdropping ratio is on the order of 10-4, and by error detection and privacy amplification, the information gained by an eavesdropper can be reduced to less than l bit. This means that it is feasible to implement quantum key dis- tribution between a ground station and a satellite in a low earth orbit. Security can be guaranteed in a high quantum exchanging rate system

关 键 词：量子密钥分配 窃听 泊松分布单光子源 光束分离器 

分 类 号：O431.2[机械工程—光学工程]